Just shoot off a case of paint with my friends Etek 3 with the Cure 4 bolt he just bought. It's awesome! The Cure 4 helps make the marker a little quieter but not as quiet as my Geo 2.1 . It improves your air efficacy and helps the accuracy of the paintball. Tired of people posting questions in the review section. If you have questions go onto Planet Eclipse's facebook page. :)